Struct ExclusionConstraint 

pub struct ExclusionConstraint {
    pub name: String,
    pub method: Option<String>,
    pub elements: Vec<(usize, String)>,
}

v7.39 (round 210) — an EXCLUDE constraint. Forbids two distinct live rows from satisfying, for EVERY element, new.col <op> existing.col (e.g. EXCLUDE USING gist (during WITH &&) = no two during ranges overlap). Unlike a uniqueness constraint the operator is not equality, so enforcement is a full live-row scan re-checking the operator (a real GiST index that answers overlap in O(log n) is a later perf phase). A NULL in any element column exempts the row (matching PG / UNIQUE NULL semantics). Persisted in catalog FILE_VERSION 72+.

Fields

name: String

The constraint’s SQL name. PG auto-names an unnamed EXCLUDE <table>_<leading-col>_excl; the engine synthesises that at CREATE TABLE time so this is always populated.

method: Option<String>

Access method spelled after USING (gist, spgist, …), lower-cased. None = no USING clause. Purely cosmetic for enforcement; it round- trips into pg_get_constraintdef.

elements: Vec<(usize, String)>

One (column-position, operator-spelling) pair per element, in declaration order. The operator spelling is the wire token (&&, =, @>, <@, &<, &>) evaluated against each existing row.

Trait Implementations

impl Clone for ExclusionConstraint

fn clone(&self) -> ExclusionConstraint

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExclusionConstraint

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExclusionConstraint

impl PartialEq for ExclusionConstraint

fn eq(&self, other: &ExclusionConstraint) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ExclusionConstraint